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Checks email addresses for syntax, MX, and SMTP validity before you send a campaign, with a bulk API.
BillionVerify checks email addresses one at a time or in bulk CSV lists, running syntax, domain, MX, SMTP, and reputation checks to flag addresses likely to bounce. It plugs into Mailchimp, HubSpot, Salesforce, SendGrid, Klaviyo, ActiveCampaign, Pipedrive, and Zapier so lists can be cleaned before a campaign goes out, and it exposes a real-time API for verifying addresses inside another app's signup flow. The free plan covers 600 verifications a month; the cheapest paid tier is $8/month billed annually for a much larger yearly credit allowance, with additional pay-as-you-go credit packs available above that. The product was previously reached at the domain emailverify.ai, which now redirects to its current address.
Cheapest paid tier is $8/month billed annually (about $96/year) for 240,000 yearly credits; the free plan gives 600 verifications/month plus small daily bonus credits.
Use tool ↗BillionVerify does one job — checking whether an email address is real and deliverable — and plugs that check into the marketing tools people already use rather than asking you to export and re-import lists. The free tier is generous enough to test on a small list, but the per-credit math on paid plans needs checking against how large your lists actually are.
Watch out: The old email-verification domain now redirects to the current one, so bookmarks or integrations pointed at the old address should be updated.
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